Let A have the block form A=[B C]
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(A的左下角是數字) in which the blocks are n x n.
(1)Prove that if B-I is nonsingular,tnen A*k=[B*k (B*k-I)(B-I)*(-1)C]
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(2)Show that R(A)*⊥=N(A*T) for A屬於R*mxn.
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